var version=parseInt(navigator.appVersion);

if (navigator.appVersion.indexOf('5.')>-1){version=5};

if (navigator.appName=='Netscape' && version < 5) {window.location='index_n4.html';}

var suff = "pic";
for(var loop = 1; loop <= 4; loop++) {
  eval(suff+loop+" = new Array();");
  eval(suff+loop+"[0] = new Image();");
  eval(suff+loop+"[1] = new Image();");
}

pic1[0].src = 'img/menuhome.png';
pic1[1].src = 'img/litehome.png';
pic2[0].src = 'img/menudisc.png';
pic2[1].src = 'img/litedisc.png';
pic3[0].src = 'img/menueven.png';
pic3[1].src = 'img/liteeven.png';
pic4[0].src = 'img/menuabou.png';
pic4[1].src = 'img/liteabou.png';

function turn_on(id) {
  eval("document.getElementById(id).setAttribute('src',"+id+"[1].src);");
}

function turn_off(id) {
  eval("document.getElementById(id).setAttribute('src',"+id+"[0].src);");
}